| 摘要 |
In order to allow an aircraft to move around autonomously on the ground, a system turns at least one wheel of the aircraft. The wheel is coupled to rotational drive means (4) comprising at least one motor coupled to said wheel by a mechanical transmission assembly (42) comprising a mechanical gearbox (6) the reduction ratio of which is continuously variable, for a limited angle of rotation of the wheel (10) of the aircraft, by means of spiral gears (61, 62) the radii of which vary continuously over practically a full revolution of said spiral gears and the reduction ratio of which is constant without limitation of the angle of rotation of the wheel (10) of the aircraft outside of said limited angle of rotation. The continuously variable reduction ratio is used to increase the torque supplied at start-up by the drive means without increasing the capability of the motor in order to be able to obtain the initial torque needed to set the wheels of the aircraft in rotation upon startup.
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